<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .header {
            position: relative;
            height: 100px;
            border: 1px solid #ccc;
        }
        
        .header div {
            width: 100px;
            height: 80px;
            border: 1px solid #ccc;
        }
        
        .left {
            position: absolute;
            left: 0;
        }
        
        .center {
            margin: auto;
        }
        
        .right {
            position: absolute;
            right: 0;
            bottom: 0;
        }
    </style>
</head>

<body>
    <div class="header">
        <div class="left">1</div>
        <div class="center">2</div>
        <div class="right">3</div>
    </div>
</body>

</html>